Mouthpiece



FIG. 1 is a top front perspective view of a mouthpiece, showing my new design, shown in use with exemplifying environmental subject matter;

FIG. 2 is an enlarged top front perspective view thereof, with some exemplifying environmental subject matter removed;

FIG. 3 is a top rear perspective view thereof; and,

FIG. 4 is another top rear perspective view thereof.

The broken lines are shown for the purpose of illustrating environmental structure and parts of the article that form no part of the claimed design. 

CLAIM The ornamental design for a mouthpiece, as shown and described. 